How long does the Lincoln 3350 battery last?

It depends on which battery your Viking 3350 PAPR system shipped with. Per Lincoln Electric’s own publication (EE14.747), the Viking PAPR platform comes in two battery options:

• Standard battery (KP3937-1) — 9 hours at 180 l/min airflow, roughly 3 hours to recharge.
• Extended battery (KP3938-1) — 16 hours at 180 l/min airflow, roughly 4.5 hours to recharge.

Both are Li-ion, rated for around 500 charge cycles, and use the same KP3932-1 charger. The extended battery is the one fitted to the K3930-6 kit (Viking 3350 XG PAPR with Extended Battery); the standard battery ships with K3930-4.

Actual runtime will fall as the battery ages toward the end of its charge-cycle life — if you’re seeing noticeably shorter runtimes than these figures, that’s consistent with a battery nearing end of life rather than a fault, but check Lincoln’s documentation for your exact kit to confirm.